Datasheet LT3437 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| Pages / Page | 28 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Efficiency and Power Loss. … |
| File Format / Size | PDF / 573 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Efficiency and Power Loss. Oscillator Frequency. vs Load Current
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LT3437
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency and Power Loss Oscillator Frequency vs Load Current FB Voltage vs Temperature vs Temperature
100 500 1.30 250 VIN = 12V 90 V 450 240 OUT = 3.3V TA = 25°C 80 400 1.28 230 POWER LOSS (mW) 70 EFFICIENCY 350 220 60 300 1.26 210 50 250 200 40 200 1.24 190 EFFICIENCY (%) FB VOLTAGE (V) FREQUENCY (kHz) 30 150 180 POWER LOSS 20 100 1.22 170 10 50 160 0 0 1.20 150 0.1 1 10 100 1000 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3437 G02 3437 G03 3437 G01
Shutdown Supply Current SHDN Threshold SHDN Pin Current vs Temperature
1.50 10 22 20 1.45 8 18 1.40 16 1.35 14 6 µA) µA) 12 1.30 ( 10 VOLTAGE (V) 1.25 I SHDN 4 CURRENT ( 8 VVIN = 80V 1.20 6 2 V 4 VIN = 60V 1.15 V 2 VIN = 12V 1.10 0 0 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VSHDN (V) TEMPERATURE (°C) 3437 G04 3437 G05 3437 G06
Switch Peak Current Limit Input Current vs Temperature Bias Current vs Temperature vs Temperature
800 600 800 700 RUN MODE 700 500 RUN MODE 600 600 400 500 500 µA) µA) ( 400 ( 300 400 I VIN I VIN 300 300 200 SLEEP MODE VBIAS = 0V 200 200 SLEEP MODE PEAK SWITCH CURRENT (mA) 100 100 SLEEP MODE VBIAS = 5V 100 0 0 0 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE ( TEMPERATURE ( °C) °C) TEMPERATURE (°C) 3437 G08 3437 G07 3437 G09 3437fc 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency and Power Loss Oscillator Frequency vs Load Current FB Voltage vs Temperature vs Temperature
100 500 1.30 250 VIN = 12V 90 V 450 240 OUT = 3.3V TA = 25°C 80 400 1.28 230 POWER LOSS (mW) 70 EFFICIENCY 350 220 60 300 1.26 210 50 250 200 40 200 1.24 190 EFFICIENCY (%) FB VOLTAGE (V) FREQUENCY (kHz) 30 150 180 POWER LOSS 20 100 1.22 170 10 50 160 0 0 1.20 150 0.1 1 10 100 1000 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3437 G02 3437 G03 3437 G01
Shutdown Supply Current SHDN Threshold SHDN Pin Current vs Temperature
1.50 10 22 20 1.45 8 18 1.40 16 1.35 14 6 µA) µA) 12 1.30 ( 10 VOLTAGE (V) 1.25 I SHDN 4 CURRENT ( 8 VVIN = 80V 1.20 6 2 V 4 VIN = 60V 1.15 V 2 VIN = 12V 1.10 0 0 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VSHDN (V) TEMPERATURE (°C) 3437 G04 3437 G05 3437 G06
Switch Peak Current Limit Input Current vs Temperature Bias Current vs Temperature vs Temperature
800 600 800 700 RUN MODE 700 500 RUN MODE 600 600 400 500 500 µA) µA) ( 400 ( 300 400 I VIN I VIN 300 300 200 SLEEP MODE VBIAS = 0V 200 200 SLEEP MODE PEAK SWITCH CURRENT (mA) 100 100 SLEEP MODE VBIAS = 5V 100 0 0 0 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE ( TEMPERATURE ( °C) °C) TEMPERATURE (°C) 3437 G08 3437 G07 3437 G09 3437fc 5
